If the latest addition to the Cambridge family is a boy, his arrival will be historic, as he will be the first royal child not to displace his older sister in the line of succession. Until the introduction of new legislation in 2015, boys were always given priority over their sisters in the line to the throne.

Middleton experienced similar problems when pregnant with her first two children, Prince George and Princess Charlotte, now aged four and two.

According to NHS Choices, hyperemesis gravidarum “is much worse than the normal nausea and vomiting of pregnancy”, with symptoms including being sick up to 50 times a day, weight loss and low blood pressure.

Princess Charlotte, the Duchess and Duke of Cambridge and Prince George in Poland in July

The news of Middleton’s pregnancy comes in a week of milestones for the family. Prince George is due to start primary school on Thursday, at Thomas’s Battersea in London. The school has found itself subject to security concerns after a local resident filmed herself walking through the building unchecked.

Sarah Burnett-Moore told The Telegraphthat while she acknowledged that term had yet to start when she entered Thomas’s, it was still worrying that nobody in the building asked her what she was doing there.

“I could have walked in with an IED and set it to go off on Thursday,” she said, adding: “Myself and lots of neighbours are worried about the security implications as the prince’s presence will make the area a target for attacks.”

It is not yet known how far along Middleton is in her pregnancy. More details as we have them…

Images: Rex Features

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Moya Crockett

Moya is Women's Editor at stylist.co.uk, where she is currently overseeing the Visible Women campaign. Carrying a tiny bottle of hot sauce on her person at all times is one of the many traits she shares with both Beyoncé and Hillary Clinton.